Power supply adapter



FIG. 1 is a front, bottom and right perspective view of a power supply adapter of our new design;

FIG. 2 is a rear, top and left perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a left side view thereof; and,

FIG. 9 is another rear, top and left perspective view thereof, with the plug in an alternate position. 

The ornamental design for a power supply adapter, as shown and described. 